Method checking_start_response

src/werkzeug/middleware/lint.py:409–433

(
            *args: t.Any, **kwargs: t.Any
        )

        chunks: list[int] = []

        def checking_start_response(
            *args: t.Any, **kwargs: t.Any
        ) -> t.Callable[[bytes], None]:
            if len(args) not in {2, 3}:
                warn(
                    f"Invalid number of arguments: {len(args)}, expected 2 or 3.",
                    WSGIWarning,
                    stacklevel=2,
                )

            if kwargs:
                warn(
                    "'start_response' does not take keyword arguments.",
                    WSGIWarning,
                    stacklevel=2,
                )

            status: str = args[0]
            headers: list[tuple[str, str]] = args[1]
            exc_info: (
                None | (tuple[type[BaseException], BaseException, TracebackType])
            ) = args[2] if len(args) == 3 else None

            headers_set[:] = self.check_start_response(status, headers, exc_info)
            return GuardedWrite(start_response(status, headers, exc_info), chunks)

        app_iter = self.app(environ, t.cast("StartResponse", checking_start_response))
        self.check_iterator(app_iter)